103121989 has 2 divisors, whose sum is σ = 103121990. Its totient is φ = 103121988.

The previous prime is 103121971. The next prime is 103122031. The reversal of 103121989 is 989121301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78021889 + 25100100 = 8833^2 + 5010^2 .

It is a cyclic number.

It is not a de Polignac number, because 103121989 - 2⁷ = 103121861 is a prime.

It is a super-2 number, since 2×103121989² = 21268289230632242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103121959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51560994 + 51560995.

It is an arithmetic number, because the mean of its divisors is an integer number (51560995).

Almost surely, 2^103121989 is an apocalyptic number.

It is an amenable number.

103121989 is a deficient number, since it is larger than the sum of its proper divisors (1).

103121989 is an equidigital number, since it uses as much as digits as its factorization.

103121989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 103121989 is about 10154.8997533211. The cubic root of 103121989 is about 468.9397997844.

The spelling of 103121989 in words is "one hundred three million, one hundred twenty-one thousand, nine hundred eighty-nine".